How do we control it? What would we do with it if we could control it?

I think of the monks in India or the Discovery channel or wherever they are from, who can control their body temperature and their heart rate. What if the normal person could do that -- or maybe the more important question should be why is the normal person not doing that? But I digress. What do they have control over? And does it mean that they just have better control over their entire body? Do they control their emotions, their moods and everything else? Can they? Do they hold off other bodily functions such as sleep, and defecating as well? Wow, I did digress.

Basically my question is how can we control more of ourselves than we do? What stops us, and how do we get past that. Because I am tired of the things stopping me in my tracks that keep me from being who I want to be. I want to be more than this, and the fears and other powers that keep me down continue to fight against me. And they definitely have the home advantage. There will be a change sometime, but I don't know when.